diff --git a/compiler/apps/playground/babel.config.js b/compiler/apps/playground/babel.config.js
index 07c3670088..9496ae7189 100644
--- a/compiler/apps/playground/babel.config.js
+++ b/compiler/apps/playground/babel.config.js
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 module.exports = function (api) {
   api.cache(true);
   return {
diff --git a/compiler/apps/playground/components/Editor/index.tsx b/compiler/apps/playground/components/Editor/index.tsx
index f0614bd50c..8a32f962bc 100644
--- a/compiler/apps/playground/components/Editor/index.tsx
+++ b/compiler/apps/playground/components/Editor/index.tsx
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import dynamic from "next/dynamic";
 
 // monaco-editor is currently not compatible with ssr
diff --git a/compiler/apps/playground/next-env.d.ts b/compiler/apps/playground/next-env.d.ts
index 4f11a03dc6..811cbc51ad 100644
--- a/compiler/apps/playground/next-env.d.ts
+++ b/compiler/apps/playground/next-env.d.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
 
diff --git a/compiler/packages/babel-plugin-react-forget/rollup.config.js b/compiler/packages/babel-plugin-react-forget/rollup.config.js
index ec6573a751..0e4c2addd7 100644
--- a/compiler/packages/babel-plugin-react-forget/rollup.config.js
+++ b/compiler/packages/babel-plugin-react-forget/rollup.config.js
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import typescript from "@rollup/plugin-typescript";
 import { nodeResolve } from "@rollup/plugin-node-resolve";
 import commonjs from "@rollup/plugin-commonjs";
diff --git a/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Gating.ts b/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Gating.ts
index 7c8775f1e3..d596401e05 100644
--- a/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Gating.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Gating.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import { NodePath } from "@babel/core";
 import * as t from "@babel/types";
 import { PluginOptions } from "./Options";
diff --git a/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Imports.ts b/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Imports.ts
index f039f04db0..d31d450c47 100644
--- a/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Imports.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/Entrypoint/Imports.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import { NodePath } from "@babel/core";
 import * as t from "@babel/types";
 import { CompilerError } from "../CompilerError";
diff --git a/compiler/packages/babel-plugin-react-forget/src/Entrypoint/index.ts b/compiler/packages/babel-plugin-react-forget/src/Entrypoint/index.ts
index 398786919f..3a68ab15cd 100644
--- a/compiler/packages/babel-plugin-react-forget/src/Entrypoint/index.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/Entrypoint/index.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 export * from "./Gating";
 export * from "./Imports";
 export * from "./Instrumentation";
diff --git a/compiler/packages/babel-plugin-react-forget/src/HIR/FindContextIdentifiers.ts b/compiler/packages/babel-plugin-react-forget/src/HIR/FindContextIdentifiers.ts
index cd3304f40c..468c7b8c6d 100644
--- a/compiler/packages/babel-plugin-react-forget/src/HIR/FindContextIdentifiers.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/HIR/FindContextIdentifiers.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import type { NodePath } from "@babel/traverse";
 import type * as t from "@babel/types";
 import { CompilerError } from "../CompilerError";
diff --git a/compiler/packages/babel-plugin-react-forget/src/Inference/InlineImmediatelyInvokedFunctionExpressions.ts b/compiler/packages/babel-plugin-react-forget/src/Inference/InlineImmediatelyInvokedFunctionExpressions.ts
index 8a42ca8441..fbaddd9a9d 100644
--- a/compiler/packages/babel-plugin-react-forget/src/Inference/InlineImmediatelyInvokedFunctionExpressions.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/Inference/InlineImmediatelyInvokedFunctionExpressions.ts
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) Facebook, Inc. and its affiliates.
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
diff --git a/compiler/packages/babel-plugin-react-forget/src/ReactiveScopes/PruneHoistedContexts.ts b/compiler/packages/babel-plugin-react-forget/src/ReactiveScopes/PruneHoistedContexts.ts
index 451badc528..fdc686cd80 100644
--- a/compiler/packages/babel-plugin-react-forget/src/ReactiveScopes/PruneHoistedContexts.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/ReactiveScopes/PruneHoistedContexts.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import {
   Identifier,
   InstructionKind,
diff --git a/compiler/packages/babel-plugin-react-forget/src/Utils/ComponentDeclaration.ts b/compiler/packages/babel-plugin-react-forget/src/Utils/ComponentDeclaration.ts
index b2686e8506..a0dd4aa14b 100644
--- a/compiler/packages/babel-plugin-react-forget/src/Utils/ComponentDeclaration.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/Utils/ComponentDeclaration.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import * as t from "@babel/types";
 
 export type ComponentDeclaration = t.FunctionDeclaration & {
diff --git a/compiler/packages/babel-plugin-react-forget/src/Validation/ValidateNoSetStateInRender.ts b/compiler/packages/babel-plugin-react-forget/src/Validation/ValidateNoSetStateInRender.ts
index f1d648b9fe..95b47b5f92 100644
--- a/compiler/packages/babel-plugin-react-forget/src/Validation/ValidateNoSetStateInRender.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/Validation/ValidateNoSetStateInRender.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import { CompilerError, ErrorSeverity } from "../CompilerError";
 import {
   BlockId,
diff --git a/compiler/packages/eslint-plugin-react-forget/__tests__/ReactForgetDiagnostics-test.ts b/compiler/packages/eslint-plugin-react-forget/__tests__/ReactForgetDiagnostics-test.ts
index c517ffe366..17ae5bdcba 100644
--- a/compiler/packages/eslint-plugin-react-forget/__tests__/ReactForgetDiagnostics-test.ts
+++ b/compiler/packages/eslint-plugin-react-forget/__tests__/ReactForgetDiagnostics-test.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import BabelESLintParser from "@babel/eslint-parser";
 import { RuleTester as ESLintTester } from "eslint";
 import ReactForgetDiagnostics from "../src/rules/ReactForgetDiagnostics";
diff --git a/compiler/packages/eslint-plugin-react-forget/rollup.config.js b/compiler/packages/eslint-plugin-react-forget/rollup.config.js
index 47397ab290..4403f1e1e3 100644
--- a/compiler/packages/eslint-plugin-react-forget/rollup.config.js
+++ b/compiler/packages/eslint-plugin-react-forget/rollup.config.js
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import typescript from "@rollup/plugin-typescript";
 import { nodeResolve } from "@rollup/plugin-node-resolve";
 import commonjs from "@rollup/plugin-commonjs";
diff --git a/compiler/packages/eslint-plugin-react-forget/src/types/hermes-parser.d.ts b/compiler/packages/eslint-plugin-react-forget/src/types/hermes-parser.d.ts
index 4fb97ce0e0..535c15880e 100644
--- a/compiler/packages/eslint-plugin-react-forget/src/types/hermes-parser.d.ts
+++ b/compiler/packages/eslint-plugin-react-forget/src/types/hermes-parser.d.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 // v0.12.1
 declare module "hermes-parser" {
   type HermesParserOptions = {
diff --git a/compiler/packages/fixture-test-utils/src/compiler-utils.ts b/compiler/packages/fixture-test-utils/src/compiler-utils.ts
index c956bffbe5..54bb9977f5 100644
--- a/compiler/packages/fixture-test-utils/src/compiler-utils.ts
+++ b/compiler/packages/fixture-test-utils/src/compiler-utils.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import assert from "assert";
 import type { runReactForgetBabelPlugin as RunReactForgetBabelPlugin } from "babel-plugin-react-forget/src/Babel/RunReactForgetBabelPlugin";
 import { CompilationMode } from "babel-plugin-react-forget/src/Entrypoint";
diff --git a/compiler/packages/fixture-test-utils/src/constants.ts b/compiler/packages/fixture-test-utils/src/constants.ts
index 36091aee78..1e876b946d 100644
--- a/compiler/packages/fixture-test-utils/src/constants.ts
+++ b/compiler/packages/fixture-test-utils/src/constants.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import path from "path";
 
 // We assume this is run from `babel-plugin-react-forget`
diff --git a/compiler/packages/fixture-test-utils/src/fixture-utils.ts b/compiler/packages/fixture-test-utils/src/fixture-utils.ts
index def72db681..fdba8808c0 100644
--- a/compiler/packages/fixture-test-utils/src/fixture-utils.ts
+++ b/compiler/packages/fixture-test-utils/src/fixture-utils.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 import fs from "fs/promises";
 import glob from "glob";
 import path from "path";
diff --git a/compiler/packages/fixture-test-utils/src/index.ts b/compiler/packages/fixture-test-utils/src/index.ts
index e3a8824c01..2620fcbad9 100644
--- a/compiler/packages/fixture-test-utils/src/index.ts
+++ b/compiler/packages/fixture-test-utils/src/index.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 export * from "./constants";
 export * from "./fixture-utils";
 export * from "./compiler-utils";
diff --git a/compiler/packages/sprout/src/SproutTodoFilter.ts b/compiler/packages/sprout/src/SproutTodoFilter.ts
index a1fa6616ac..e885505a7c 100644
--- a/compiler/packages/sprout/src/SproutTodoFilter.ts
+++ b/compiler/packages/sprout/src/SproutTodoFilter.ts
@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 const skipFilter = new Set([
   /**
    * Category A:
diff --git a/compiler/packages/sprout/src/shared-runtime.ts b/compiler/packages/sprout/src/shared-runtime.ts
index e30e72e967..fd386d0366 100644
--- a/compiler/packages/sprout/src/shared-runtime.ts
+++ b/compiler/packages/sprout/src/shared-runtime.ts
@@ -4,6 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
+
 import React from "react";
 
 /**